net: bcmgenet: convert RX path to page_pool

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Replace the per-packet __netdev_alloc_skb() + dma_map_single() in the
RX path with page_pool. SKBs are built from pool pages via
napi_build_skb() with skb_mark_for_recycle() so the network stack
returns pages to the pool, and DMA mapping happens once per page
instead of once per packet.

Reject HW-reported lengths smaller than the RSB so a runt cannot
underflow the SKB build path.

Drop the now-unused priv->rx_buf_len field and the rx_dma_failed soft
MIB counter (nothing increments it after the conversion). This
removes the "rx_dma_failed" entry from ethtool -S, which is a
user-visible change for monitoring tools that key on stat names.

Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Justin Chen <justin.chen@broadcom.com>
Tested-by: Justin Chen <justin.chen@broadcom.com>
Link: https://patch.msgid.link/20260610114835.2225423-1-nb@tipi-net.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Nicolai Buchwitz 2026-06-10 13:48:35 +02:00 • committed by Jakub Kicinski

parent aeb62be4d3

commit 7bc054c2d4

3 changed files with 141 additions and 85 deletions

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1

drivers/net/ethernet/broadcom/Kconfig

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226

drivers/net/ethernet/broadcom/genet/bcmgenet.c

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5

drivers/net/ethernet/broadcom/genet/bcmgenet.h

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